*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg: #f5f5f7;--color-surface: #ffffff;--color-border: #d1d1d6;--color-text: #1d1d1f;--color-text-muted: #6e6e73;--color-primary: #0071e3;--color-primary-hover: #0077ed;--color-danger: #ff3b30;--color-success: #34c759;--radius: 12px;--shadow: 0 2px 12px rgba(0, 0, 0, .08);--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}body{font-family:var(--font);background:var(--color-bg);color:var(--color-text);min-height:100vh;display:flex;align-items:center;justify-content:center}input{width:100%;padding:10px 14px;border:1px solid var(--color-border);border-radius:8px;font-size:15px;font-family:var(--font);outline:none;transition:border-color .15s}input:focus{border-color:var(--color-primary)}button{cursor:pointer;font-family:var(--font);font-size:15px;border:none;border-radius:8px;padding:10px 20px;transition:background .15s,opacity .15s}button:disabled{opacity:.6;cursor:not-allowed}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}.error-message{color:var(--color-danger);font-size:13px;margin-top:6px}.success-message{color:var(--color-success);font-size:13px;margin-top:6px}